<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div>XXXX</div>
  <button>测试</button>
  <input type="text" >
  <script>
    let div = document.querySelector('div')
    div.onclick = function(e){
      // console.log(this.innerHTML);
      console.log(e.target.innerHTML);
    }

    let btn = document.querySelector('button')
    btn.onclick = function(e){
      console.log(e);
    }

    let input = document.querySelector('input');
    input.onchange = function(){
      console.log(this.value);
    }

    // div.addEventListener('click', function(){});
  </script>
</body>
</html>